package edu.denishamann.guesstimate.route;

import java.io.IOException;
import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import android.util.Log;

/**
 * 
 * class for DOM management.<br/>
 * code copied from: <a href="http://stackoverflow.com/questions/17421506/how-to-parse-same-name-tag-in-android-xml-dom-parsing">http://stackoverflow.com/questions/17421506/how-to-parse-same-name-tag-in-android-xml-dom-parsing</a>
 * @author denis
 *
 */
public class XMLParser {
	
	private static final String TAG="XMLParser";
	
	public Document getDomElement(String xml){
        Document doc = null;
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        try {
 
            DocumentBuilder db = dbf.newDocumentBuilder();
 
            InputSource is = new InputSource();
                is.setCharacterStream(new StringReader(xml));
                doc = db.parse(is); 
 
            } catch (ParserConfigurationException e) {
                Log.e(TAG, e.getMessage());
                return null;
            } catch (SAXException e) {
                Log.e(TAG, e.getMessage());
                return null;
            } catch (IOException e) {
                Log.e(TAG, e.getMessage());
                return null;
            }
                // return DOM
            return doc;
    }
    
	public String getValue(Element item, String str) {      
	    NodeList n = item.getElementsByTagName(str);        
	    return this.getElementValue(n.item(0));
	}
	 
	public final String getElementValue( Node elem ) {
	         Node child;
	         if( elem != null){
	             if (elem.hasChildNodes()){
	                 for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() ){
	                     if( child.getNodeType() == Node.TEXT_NODE  ){
	                         return child.getNodeValue();
	                     }
	                 }
	             }
	         }
	         return "";
	  } 
	
}
